Chemical Engineering in Daily Life - Question 2 - Standard Answers Available
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The last edit to this post was made by yjqin1 on 2015-8-20 at 17:47. In the north, many new homes are equipped with underfloor heating, which keeps the rooms very warm; the elderly really like it, and young people also dress lightly, covering themselves only with a thin blanket at night. However, the problem this causes is that the indoor humidity becomes too low, with a relative humidity of generally 15-30%, and it drops even lower during windy weather, to below 10%. The optimal relative humidity for the human body is 45-65%. This is one of the reasons why people from the north look much older than those from the south. How to keep a room humid? Methods include: 1. Growing flowers ； 2. Wipe the floor once a day ； 3. Hang clothes to dry 4. Place a few water containers in the room ； 5. Place a large water container in the room so that the area covered by water on the floor accounts for more than 1% of the total area of the exposed floor. Please make a choice. Background data: At 25 degrees, the relative air humidity corresponding to a saturated aqueous solution of sodium hydroxide is 6%, that of a saturated aqueous solution of potassium hydroxide is 8%, that of a saturated aqueous solution of calcium chloride is 29%, that of a saturated aqueous solution of magnesium chloride is 33%, that of a saturated aqueous solution of sodium chloride is 75%, and that of a saturated aqueous solution of sodium sulfate is 89%. Do you or your husband want your skin to remain in phase equilibrium with a saturated aqueous solution of potassium hydroxide or calcium chloride throughout the day? For otakus or homebodies, the best cosmetics are an optimized relative humidity. .
Someone looked at this question, but no one answered it.
I don’t understand, but I think it might be nice to use a water tank to keep fish in it – it looks good and it can also increase humidity
Usually, a basin of water is placed inside the house
Quantitatively, placing 5 basins of water in a room the size of a bedroom increases the relative humidity by 10–15 percentage points.
Wipe the floor regularly, open the windows as well, and place a basin of water in the room.
Opening the window means air exchange. In winter, the outside air temperature is zero degrees and the humidity is below 50%; when such air is brought inside and warmed up, the humidity in the room only decreases further. Therefore, Americans who use systems to control humidity, temperature, and air filtration in their rooms do not have the habit of opening windows in the morning. A daughter-in-law who is a foreign student had an argument with her mother-in-law who came to visit.
Compared to the low humidity inside the room, opening the windows would allow the outside air with higher humidity to come in, right?
For multiple-choice options, select as follows (my home doesn’t have underfloor heating, but I still do this): 1. Growing flowers； 2. Wipe the floor once a day ； 4. Place a few water containers in the room ； Topic 3: Hanging up clothes. It’s not used every day, but after washing clothes at night, it increases the humidity in the room; the clothes are usually dry by the next day. Topic 5: That’s inconvenient, unless it’s placed in the bathroom. Putting it in a room takes up too much space!
The relative humidity of the outdoor air in the northern regions during winter, when frost is present, is close to or exceeds 100%. Is this wet enough? But after being placed indoors and heated, its relative humidity drops to 10-30%.
This post was last edited by yjqin1 on 2015-8-20 at 17:39. Standard answer: 1. Keep a large number of flowers in the room, and water them regularly (this may not be aesthetically pleasing, as some flowers release toxic substances); the amount of water needed per day should be ≥5 kilograms； 2. Sweep the floor more than 3 times a day, and ensure thorough cleaning; the water consumption will be at least 5 kilograms (for an area of 100 square meters) ； 3. Wash the clothes once every morning and hang them to dry; at night, place more than two large towels over them (the towels should be boiled regularly, otherwise they will develop an unpleasant odor) ； 4. Install high-power humidifiers indoors; those that use the evaporation principle rather than the ultrasonic principle should be chosen. Nanoscale inorganic salts are also highly toxic (unless you use ultra-pure water with a conductivity of less than 1 us/cm). The amount of water that evaporates per day should exceed 5 kilograms per 100 square meters ； 5. Place a water tray of 1 to 3 square meters in the geothermal room; add water regularly and clean it periodically to prevent crystallization from forming. Of course, this makes it look even less attractive. But it is the most effective, with the most stable humidity control. 6. The simplest method is to hang a large wet towel in every bedroom where people sleep at night (use a special rod or rack, so as not to damage the furniture that is in close contact with it). A simple fact: In Tianjin, if the outdoor temperature is 0 degrees and the indoor temperature is 25 degrees, with the building located on the 2nd to 30th floor and having an area of 150 square meters, under normal conditions 10 kilograms of water need to evaporate per day in order to maintain a relative humidity of over 45% in the room ； On windy days, the evaporation rate can exceed 17 kilograms; I have actual measurement data on this. Do you know the differences in beauty standards among people from Harbin, Dalian, Qingdao, Weihai, Shanghai, Hangzhou, Chongqing, and Chengdu? In fact, the main reason (and the only one) is the difference in air humidity in winter; race, sunlight (ultraviolet rays), and dietary differences are not major factors. As for Beijing, Tianjin, Zhengzhou, Xi’an, Wuhan, and Changsha, in winter cold air can penetrate deep into these areas (without any mountains to block it), so there isn’t much difference in the appearance of the girls there.